JPS63299313A - Manufacture of aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To realize miniaturization while keeping sealing properties, by packaging the outer side except the upper part of a capacitor element with photoset resin, dripping a driving electrolyte from an opening end, and sealing the opening end with photoset resin. CONSTITUTION:An anode foil and a cathode foil between which a separator is interposed are wound to form a capacitor element 1. The outer sider except the upper part of the element is packaged with photoset resin 5. From an upper opening end, electrolyte for driving is dripped, and then the opening end is sealed with photoset resin 6. Thereby, miniaturization keeping sealing properties can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing aluminum electrolytic capacitors used in various electronic devices.

Conventional technology As shown in Figure 2, this type of conventional aluminum electrolytic capacitor has an anode foil and a cathode made by roughening high-purity aluminum foil to increase its surface area and forming a dielectric oxide film through anodization. The capacitor element 1, which is wound with a foil together with a separator and impregnated with a driving electrolyte, is housed in a bottomed cylindrical metal case 2, and the open end is sealed using a sealing member 3, and the capacitance is
An insulating tube 4 on which the rated working voltage etc. are printed is attached to complete the product.

Problems to be Solved by the Invention In the conventional aluminum electrolytic capacitors, there is a strong desire for miniaturization as electronic devices become lighter, thinner, and smaller. However, in conventional aluminum electrolytic capacitors, a rubber-like elastic body is used as the sealing member as described above, and this has been a factor in preventing miniaturization in order to prevent evaporation of the driving electrolyte.

In other words, there are two routes for evaporation of the driving electrolyte. One path is the interface between the sealing member and the two lead wires and the interface with the metal case. The sealing member made of a rubber-like elastic body, the lead wire, and the metal case are only in close contact with each other due to the repulsive force of the rubber-like elastic body due to the drawing process of the metal case, and the driving electrolyte evaporates from an extremely small gap. do.

Moreover, the second path passes through the sealing member. Although slight differences occur depending on the material of the rubber-like elastic body and the combination of the material of the rubber-like elastic body and the material of the driving electrolyte, the driving electrolyte passes through. In order to prevent such evaporation of the driving electrolyte, the thickness of the sealing member has been increased, the drawing process has been made more powerful, and the permeation rate has been reduced.

For this reason, 1. the volumetric proportion of the sealing member in the aluminum electrolytic capacitor has increased, which has become an obstacle to miniaturization.

The present invention aims to solve these problems and achieve miniaturization while maintaining sealing performance.

Means to Solve the Problems In order to solve the problems of the conventional art, the present invention provides a capacitor element by winding an anode foil and a cathode foil with a separator in between. After the outside is covered with a photocurable resin, a driving electrolyte is dripped from the open end of the upper surface, and then the open end is sealed with a photocurable resin, and the whole is covered with resin as necessary.

Function According to the present invention, since a sealing member made of a rubber-like elastic body is not used, it is possible to downsize the device.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a capacitor element, 6 is a resin layer made of a photocurable resin, and 6 is a resin layer also made of a photocurable resin.

An anode foil and a cathode foil produced by a general method are wound together with a separator interposed therebetween, immersed in a liquid photocurable resin, and quickly photocured to form a resin recess.

After dropping the driving electrolyte from the open end of the upper surface,
A liquid photocurable resin is placed on the open end and similarly quickly photocured to form a lid and sealed. In addition,
Furthermore, a resin exterior may be applied if necessary (not shown).

Effect of the invention According to the present invention, the following effects can be obtained.

(1) Aluminum electrolytic capacitors can be made smaller.

(ii) The number of parts used for the exterior is small, making it possible to improve productivity and reduce costs.

(iii) An aluminum electrolytic capacitor with improved sealing performance and long life can be obtained.

The present invention has the above-mentioned effects, and its industrial value is significant.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an aluminum electrolytic capacitor obtained by a method according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional aluminum electrolytic capacitor. 1... Capacitor element, 6, 6... Resin layer. Name of agent: Patent attorney Toshio Nakao and one other name
1 Figure /-Content 1 element 2nd
figure

Claims (1)

[Claims] An anode foil and a cathode foil are wound with a separator in between to form a capacitor element, the outside of the capacitor element except for the top surface is covered with a photocuring resin, and then a driving electrolyte is applied to the capacitor element from the open end of the top surface. After dispensing, the open end is sealed with a photocurable resin, and if necessary, the entire aluminum electrolytic capacitor is covered with resin.